While the increase has been great, the oil production increase is not quite that high. 45% increase in 3 years, from 5.5 MMBPD to 7.9 MMBPD.
U.S. Field Production of Crude Oil
http://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=MCRFPUS2&f=M
I was quoting from another thread. Didn’t look up the numbers personally. Me culpa.